EP2400060A1 - Pfosten mit zerbrechlichem Rohrabschnitt - Google Patents

Pfosten mit zerbrechlichem Rohrabschnitt Download PDF

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Publication number
EP2400060A1
EP2400060A1 EP10251141A EP10251141A EP2400060A1 EP 2400060 A1 EP2400060 A1 EP 2400060A1 EP 10251141 A EP10251141 A EP 10251141A EP 10251141 A EP10251141 A EP 10251141A EP 2400060 A1 EP2400060 A1 EP 2400060A1
Authority
EP
European Patent Office
Prior art keywords
column
pole
base
tube section
frangible tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10251141A
Other languages
English (en)
French (fr)
Inventor
Johan Samuel Haakmat
Andrew James Den Bakker
Thomas Maria Van Veenendaal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunter Douglas Industries BV
Original Assignee
Hunter Douglas Industries BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunter Douglas Industries BV filed Critical Hunter Douglas Industries BV
Priority to EP10251141A priority Critical patent/EP2400060A1/de
Publication of EP2400060A1 publication Critical patent/EP2400060A1/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
    • E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
    • E01F9/623—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection
    • E01F9/631—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection specially adapted for breaking, disengaging, collapsing or permanently deforming when deflected or displaced, e.g. by vehicle impact
    • E01F9/635—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by form or by structural features, e.g. for enabling displacement or deflection specially adapted for breaking, disengaging, collapsing or permanently deforming when deflected or displaced, e.g. by vehicle impact by shearing or tearing, e.g. having weakened zones

Definitions

  • the present invention relates to a utility pole such as a pole for traffic lights, a pole for traffic signs, a lighting column or flag pole or the like that includes a frangible tube section.
  • the utility pole of the invention includes a mast or column to which the luminaire, traffic light , traffic sign or the like is mounted, a base to anchor the pole in the ground and an intermediate frangible tube section connecting the column to the base.
  • frangible tube section The purpose of the frangible tube section is to provide a passive safety feature to the pole in that upon impact by a vehicle the damage to the vehicle will be reduced and the occupants will run less risk of being hurt.
  • Levels of safety are defined in defined in the European Standard EN12767. This standard defines tests to assign safety levels for occupants in a passenger vehicle for three categories of types of utility poles, high energy absorbing (HE), low energy absorbing (LE) and non energy absorbing (NE). The occupant safety levels per category range from lowest 1 to highest 3 with an additional level 4 (very safe) for the non energy absorbing poles.
  • the EN 12767 features an obligatory qualification test in which a car that moves with 35km/hour is impacted upon the utility pole that is tested. The collision test measures an ASI (acceleration severity index) and THIV (theoretical head impact value). For example for non energy absorbing poles to get an occupant safety level rating of 1 in the obligatory qualification test the THIV is allowed to be 27 km/hour at the most and the ASI has a maximum value of 1,0.
  • poles it is of course desirable for manufacturers of utility poles to get a good safety rating for the poles. This can be done by designing a pole to disengage the column from the base after impact by breaking a bolt-like connection and sliding it off, known e.g. from - EP2014850 or US5535555 .
  • the pole is designed to collapse by deforming the pole after impact while the pole is to remain attached to the base, known from e.g. EP0156158 .
  • the pole is designed to break upon impact such that after impact the column is severed from the base completely or for the most part, known from e.g. US 6,516,573 , US20080250752 , EP146401 .
  • Poles that are designed to break upon impact generally comprise of a column connected to a base by an intermediate frangible section.
  • the frangible tube section thus needs to be strong enough to carry the utility column but needs to break upon impact.
  • the known frangible tube sections all are weaker than the column and base or include a weakened portion.
  • EP 146401 proposes to make the sleeve of a weaker material with an optional line of weakness e.g. by perforations.
  • US20080250752 introduces a weld which forms a breakaway joint between the column and the base, and optionally introduces a backer ring such that a pair of spaced apart circumferential breakaway weld joints may be formed.
  • a utility pole in which the utility pole includes a column for carrying a utility member such as a traffic light, a traffic sign, a luminaire, a flag or the like, and a base for anchoring the pole to the ground and a frangible tube section connecting the column and the base wherein, the frangible section is of a brittle aluminium alloy having an elongation value as measured and expressed by the elongation A50 mm index of equal to or less than 2% and an Rp0,2 strength value of at least 180 Mpa.
  • the frangible tube section includes a top and bottom portion insertable into respectively the column and the base.
  • the frangible tube section further includes an intermediate portion and this intermediate portion remains exposed between the column and the base. Further advantageously the intermediate portion is a shoulder portion flush with or projecting outward with respect to the column. Also further advantageously the frangible tube section is connected to the column and the base by adhesive.
  • the pole is rated according to European standard EN 12767 as being in non energy absorbing category and having an occupant safety level rating of 1, 2 or 3
  • the aluminium alloy is a cast aluminium alloy.
  • the utility pole 1 as shown in figure 1 has a column 3, a base 5 and a frangible tube section 7.
  • the base 5 is anchored in the ground (G).
  • the frangible section 7 has a visible shoulder portion 9 between column 3 and base 5.
  • the sleeve 7 is at ground level.
  • a utility hatch 11 is present in the column 3 just above the visible portion 9 of the breakaway sleeve 7.
  • FIG 2 a cross-section of a portion of utility pole 1 is shown, and in Figure 3 a cross-section of the frangible tube 7 is shown by itself.
  • Figures 2 and 3 clearly show the top and bottom portions 13, 15 of the breakaway sleeve and its intermediate shoulder portion 9.
  • the top and bottom portions 13, 15 of the sleeve are chamfered to allow insertion in the hollow column and base.
  • the top and bottom portions 13,15 of the frangible tube section are radially inward from the intermediate shoulder portion 9.
  • a top and bottom rim 13A, 15A is present onto which the column lower end 3A and base upper end 5A abuts.
  • the shoulder 9 of the frangible tube 7 and the column 3 and base 5 together form a smooth outer surface of the utility pole.
  • the top and bottom portions of the sleeve are connected to the column and base by adhering with a suitable adhesive, such as an epoxy resin.
  • a suitable adhesive such as an epoxy resin.
  • a top adhesive bond 17 is formed between the upper sleeve portion 13 and the column section in contact with the upper sleeve portion.
  • a lower adhesive bond 19 is formed between the lower tube portion 15 and the base portion that is in contact with the lower sleeve portion 15.
  • the strength of the adhesive bonds is determined by the shear strength factor of the adhesive and the adhesive bond area.
  • FIG 4 A second embodiment of the utility pole of the invention is shown in figure 4 where for like parts the same reference numerals as in Figures 1-3 are used greater by 100.
  • the utility pole 101 is shown with column 103 and base 105 interconnected by a frangible tube section 107.
  • the column 103 abuts with one free end 103A a free end 105A of the base 105.
  • the frangible tube section 107 is encompassed within the column and base. Halve of the frangible tube section 107 is inside the column 103 and the other halve is inside the base section 105.
  • the frangible tube section 107 is adhesively bonded to the column and base of the utility pole.
  • a third embodiment of the utility pole of the invention is shown in figure 5 where for like parts the same reference numerals are used as in Figures 1-3 greater by 200.
  • the utility pole 201 is shown with column 203 and base 205 interconnected by frangible tube section 207.
  • the base 205 has thicker walls then the column 203. The advantage of the thicker walls of the base is that upon impact of a car onto the utility pole the impact energy will not or only slightly deform the base and will thus be guided more completely to the frangible tube section. Thus a base with thicker walls will improve the breaking properties of the frangible tube section of the utility pole.
  • the base 205 is anchored in the ground such that the bottom rim 215A of the shoulder of the frangible tube section, which is atop the upper end 205A of the base 205 is at or adjacent ground level, similar as indicated in figure 1 .
  • the frangible tube section (7, 107, 207) is formed from a cast aluminium alloy being brittle and having good fracture properties and having an elongation value as measured and expressed by the elongation A50 mm index of equal to or less than 2% and an Rp0,2 strength value of at least 180 Mpa.
  • the A50 mm value is 1,5% or less.
  • This type of aluminium is brittle and has good fracture properties, in that it breaks upon being impacted by a mass.
  • an aluminium alloy for the frangible tube section (7, 107, 207) is selected from alloys within the range starting with the EN AC-41xxx alloys and ending with the EN AC-47xxx alloys groups denoted according to EN1780-1, where xxx denotes numerical values defining specific alloy compositions.
  • EN 1780-1 is the European standard for the designation of aluminum and aluminum alloys.
  • the European Standard (EN) and International Aluminum Association (UNS) for wrought products use the same numerical designations with the prefix EN or AW respectively.
  • the designation is constituted successively by prefix EN (European Standard) followed by a blank space, followd by letter A representing aluminum, followed by a letter representing the form of the product, i.c. letter C which represents castings alloys, followed by a hyphen and five figures representing the alloy composition limits.
  • the first of the five figures indicates the major alloying elements as follows: copper: 2XXXX, silicon: 4XXXX, magnesium: 5XXXX and zinc: 7XXXX.
  • the second of the five figures indicates the alloy group as follows: Thus as indicated in the range above, the cast aluminium alloys that are preferably selected are alloyed with Silicon, thus the first of the five figures is "4".
  • the pole will be designed to have a uniform strength in column, frangible tube section and base.
  • the frangible tube section can be designed to be even stronger than the column and/or base of the pole. This may be desirable in order for the complete utility pole to comply with normal use requirements, i.e. resistance to wind loads or the like.
  • the cast aluminium frangible tube section will be made with a certain wall thickness and/or height in order to obtain the desired resistance to breaking as well as the required strength for normal use conditions.
  • V adhesive for the adhesive can be calculated and depends on the surface area of the adhesive and the shear strength value of the adhesive (S) that was used.
  • This value V adhesive has to be equal or higher then the values V column , V base or V tube-section in order for the bond to hold upon impact and 'isolate' the fracture properties of the frangible tube section.
  • the surface area for the the adhesive bond between e.g. the column 3 and upper portion 13 of the frangible tube section 7 is determined by diameter (D column ) (inner diameter of the column multiplied by the height (L adhesive-column ) of the column along which the adhesive is applied and which is in contact with both the column and the frangible tube section.
  • D column diameter of the column multiplied by the height (L adhesive-column ) of the column along which the adhesive is applied and which is in contact with both the column and the frangible tube section.
  • ThUS V adhesive D column * L adhesive-column * S.
  • L adhesive-column V column / (S * D column ) Similarly the calculation can be done for the adhesive bond between the base 5 and the lower portion 15 of the frangible tube section.
  • the utility pole can have a height of between 2 and 20 meters.
  • the position of the frangible tube section is preferably at the ground level and can also be further above the ground level but is generally never more than 60cm above the ground.
  • the thickness of the frangible tube section is preferably between 2 and 100 mm.
  • the height of the intermediate shoulder portion (9, 209) of the frangible tube section is preferbly between 5 and 400 mm.
  • the operation and construction of the present invention will be apparent from the foregoing description.
  • the invention is further limited by the terms of the claims and not limited to the embodiment herein described, as such it will be clear that the cross-sectional shape of in particular the pole's column and base is not limited to a cylindrical cross-section and oval, but that multi-gonal cross-sections are equally possible.
  • the utility pole is preferably an all aluminium pole, the column and the base can be made of other materials including steel, iron, plastics or fiber reinforced composites.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
EP10251141A 2010-06-24 2010-06-24 Pfosten mit zerbrechlichem Rohrabschnitt Withdrawn EP2400060A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10251141A EP2400060A1 (de) 2010-06-24 2010-06-24 Pfosten mit zerbrechlichem Rohrabschnitt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10251141A EP2400060A1 (de) 2010-06-24 2010-06-24 Pfosten mit zerbrechlichem Rohrabschnitt

Publications (1)

Publication Number Publication Date
EP2400060A1 true EP2400060A1 (de) 2011-12-28

Family

ID=43098912

Family Applications (1)

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EP10251141A Withdrawn EP2400060A1 (de) 2010-06-24 2010-06-24 Pfosten mit zerbrechlichem Rohrabschnitt

Country Status (1)

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EP (1) EP2400060A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2918750A1 (de) * 2014-03-14 2015-09-16 Valmont Nederland B.V. Mastvorrichtung
USD762319S1 (en) 2014-08-05 2016-07-26 Alex Urquhart Lighting fixture for banners and flags
EP3081695A1 (de) 2015-04-13 2016-10-19 Hunter Douglas Industries B.V. Strommast mit abscherender kupplungsanordnung
US20190063100A1 (en) * 2017-08-25 2019-02-28 Pepco Holdings LLC Utility Pole with Energy Absorbing Layer
CN110108900A (zh) * 2019-05-31 2019-08-09 成都辟思航空科技有限公司 玻璃钢制直升机停机坪专用风向袋

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA889569A (en) * 1969-07-11 1972-01-04 Powerlite Devices Limited Frangible lighting pole
EP0146401A2 (de) 1983-12-20 1985-06-26 Geoffrey Lawson Norman Stratham Verfahren und Vorrichtung zur Halterung von rohrförmigen Pfosten
EP0156158A1 (de) 1984-03-14 1985-10-02 Eberhard Hoeckle Verkehrszeichenträger
US5535555A (en) 1995-11-17 1996-07-16 The University Foundation, California State University Breakaway post coupling
US6457895B1 (en) * 2000-07-05 2002-10-01 Mark T. Salman Flush mount breakaway post coupler
US6516573B1 (en) 1999-01-06 2003-02-11 Tyco Flow Services Ag Integrated breakaway for support posts
US20080250752A1 (en) 2007-04-12 2008-10-16 Hapco Aluminum Pole Products Embeddable breakaway utility pole
EP2014850A1 (de) 2007-07-11 2009-01-14 Sapa Profiles NL B.V. Verbindungsstruktur für einen verkehrssicheren Balken

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA889569A (en) * 1969-07-11 1972-01-04 Powerlite Devices Limited Frangible lighting pole
EP0146401A2 (de) 1983-12-20 1985-06-26 Geoffrey Lawson Norman Stratham Verfahren und Vorrichtung zur Halterung von rohrförmigen Pfosten
EP0156158A1 (de) 1984-03-14 1985-10-02 Eberhard Hoeckle Verkehrszeichenträger
US5535555A (en) 1995-11-17 1996-07-16 The University Foundation, California State University Breakaway post coupling
US6516573B1 (en) 1999-01-06 2003-02-11 Tyco Flow Services Ag Integrated breakaway for support posts
US6457895B1 (en) * 2000-07-05 2002-10-01 Mark T. Salman Flush mount breakaway post coupler
US20080250752A1 (en) 2007-04-12 2008-10-16 Hapco Aluminum Pole Products Embeddable breakaway utility pole
EP2014850A1 (de) 2007-07-11 2009-01-14 Sapa Profiles NL B.V. Verbindungsstruktur für einen verkehrssicheren Balken

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2918750A1 (de) * 2014-03-14 2015-09-16 Valmont Nederland B.V. Mastvorrichtung
USD762319S1 (en) 2014-08-05 2016-07-26 Alex Urquhart Lighting fixture for banners and flags
EP3081695A1 (de) 2015-04-13 2016-10-19 Hunter Douglas Industries B.V. Strommast mit abscherender kupplungsanordnung
US20190063100A1 (en) * 2017-08-25 2019-02-28 Pepco Holdings LLC Utility Pole with Energy Absorbing Layer
WO2019040466A1 (en) * 2017-08-25 2019-02-28 Pepco Holdings LLC UTILITY POST WITH ENERGY ABSORPTION LAYER
US10435911B2 (en) 2017-08-25 2019-10-08 Pepco Holdings LLC Utility pole with energy absorbing layer
CN110108900A (zh) * 2019-05-31 2019-08-09 成都辟思航空科技有限公司 玻璃钢制直升机停机坪专用风向袋

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